GLASS FURNACE

Description

[0001] The present disclosure is directed to an arrangement for feeding glass batch material into a furnace according to claim 1, at a location below glass melt level to eliminate problems associated with the batch blanket that is otherwise formed on the top surface of the glass melt.

Background and Summary of the Disclosure

[0002] Typically, the natural gas burners that provide energy for a glass melting furnace are located in the walls of the furnace. The flames from the burners extend across the width or the length of the furnace, slightly above and approximately parallel to the top surface of the glass melt within the furnace. Heat energy is transferred from the burner flames to the top surface of the glass melt primarily by conduction and radiation. In a typical furnace, raw batch materials are added to the furnace by distributing the raw materials on top of the existing glass melt, creating a batch 'blanket' of raw materials on the top surface of the glass melt. The raw batch materials consist of dry particles, ranging in grain size from approximately 0.02 to 1.0 mm.

[0003] Adding the raw batch materials into a glass furnace in this manner presents several operational difficulties. First, the dry batch materials are poor conductors of heat due to their low heat transfer coefficients and radiation emissive factors. As a result, the blanket of raw batch materials on the surface of the melt functions as an insulating layer that decreases the amount of heat energy that is transferred from the burners to the glass melt.

[0004] Another issue is the disturbance of the dry materials by the glass burner flames. The flow of air from the flames causes turbulence that disturbs and picks up the dry materials. The dry materials become entrained in the exhaust gases that exit the furnace flue or stack, a situation referred to as 'batch carryover', resulting in environmental air emissions such as opacity and particulate matter emissions. A third issue caused by the blanket of dry batch materials is the loss of light chemical elements such as sodium from the glass melt due to volatilization of these light elements. The loss of batch materials due to carryover or volatilization alters the chemistry of the glass melt, resulting in a final glass chemistry that is outside of the desired chemical specification, which alters the properties of the final glass product. To avoid these problems with dry batches, glass melting furnace feedstock is typically wetted with water (0-5% by weight). Although batch wetting mitigates many of the problems discussed herein, it can cause others such as poor batch transport conditions, segregation, and additional energy consumption in the glass melting furnace to drive off the added water. Document US 1 834 631 A provides an apparatus for continuously producing from a glass batch having a conveyer. The raw batch material is not partially melted before entering the glass melt. Document US 2 354 807 A provides a method for manufacturing a porous glass material comprising a batch feeder. No partially heating of the raw batch material before entering the glass melt is provided. Also Document EP 0 135 446 A1 provides a feeding mechanism without heating the raw batch material, wherein the raw batch material is added to the furnace by distributing the material on the top of the glass melt. Finally, document WO 2014/036979 A1 provides a method for continuous glass melting under controlled convection.

[0005] A general object in accordance with one aspect of the disclosure is to provide a raw batch material feeder for glass furnaces that eliminates the raw batch material blanket that may be formed on the top surface of the melt when batch material is fed onto the top surface of the melt, and the problems associated with such a batch blanket.

[0006] Another object in accordance with another aspect of the disclosure is to eliminate the raw batch material blanket that reduces the amount of heat energy that is transferred from the gas burners to the glass, thereby increasing the efficiency of the furnace, by increasing the amount of heat energy that is transferred from the burner flames to the glass melt.

[0007] Another object in accordance with another aspect of the disclosure is to eliminate the loss of light chemical elements such as sodium from glass melt due to volatilization at high temperature.

[0008] A still further object in accordance with another aspect of the disclosure is to eliminate batch carryover. The present disclosure embodies a number of aspects that can be implemented separately from, or in combination with, each other.

[0009] A glass furnace in accordance with one aspect of the disclosure includes a furnace melt chamber to contain a glass melt having a top surface; and a batch feeder to receive glass batch material and feed said material to the furnace melt chamber below the level of the glass melt top surface.

Brief Description of the Drawings

[0010] The disclosure, together with additional objects, features, advantages and aspects thereof, will be best understood from the following description, the appended claims and the accompanying drawings, in which:

FIG. 1 is a schematic top view of a glass melting furnace having feed chutes for batch material connected to a bottom portion of the furnace.

FIG. 2 is a side view of the glass melting furnace of FIG. 1 showing the feed chutes and the feed path for batch material fed into the bottom portion of the furnace.

FIG. 3 is a side view of another illustrative embodiment of a glass melting furnace having a side mounted hopper that supplies batch material to a horizontal screw feeder and a batch material heater in a well that are located proximate to a bottom of the furnace.

FIG. 4 is a side view of another illustrative embodiment of a glass melting furnace having a side mounted hopper that supplies batch material to a vertical screw feeder and a batch material heater and well that are located proximate the bottom of the furnace.

FIG. 5 is a side view of another illustrative embodiment of a glass melting furnace having submerged burners and a side mounted hopper that supplies batch material to a horizontal screw feeder located proximate a bottom of the furnace.

Detailed Description of Preferred Embodiments

[0011] FIG. 1 illustrates a schematic top view of a glass melting furnace generally designated by the reference numeral 10. The furnace has a furnace melt chamber 12 for melting the raw batch materials which in operation contains a pool 14 of molten glass as understood by those skilled in the art. One or more batch feed chutes 16 may be connected to the furnace 10, for example, at a bottom portion thereof. A batch feed inlet 17 may be coupled to each batch feed chute 16 for the introduction of raw batch materials to the feed chute. Each of the batch feed chutes 16 may contain a batch feeder, for example, a screw conveyor 18. Each of the batch feed chutes 16 may be coupled to a heater 20 having an outlet 21 as more fully described below. A dam wall 22 may be disposed between the screw conveyor 18 and the melt chamber 12. The dam wall 22 creates a well 23 or a series of wells prior to the melt chamber 12 and may contain the heaters 20. The dam wall 22 may be positioned between the heater outlets 21 and the remainder of the furnace and separates the heaters 20 and the heater outlets 21 from the remaining volume of the furnace 10.

[0012] FIG. 2 is a side view of the glass melting furnace 10 of FIG. 1 showing one of the batch feed chutes 16 and a feed path for raw batch materials fed into the furnace 10. Heat in the furnace 10 may be provided by top mounted heating elements 26 which may be powered by natural gas. Other types of heating elements may be used and in any suitable locations. An outlet of the feed chute 16 may be coupled to the heater 20.

[0013] The heater 20 may comprise an enclosure 19 which may have an outlet 21 on the top thereof, and a heating element contained within the enclosure 19. The heating element may comprise a gas or an electric heater element as desired. The heater 20 may also include an internal screw conveyor 24. The screw conveyor 24 may provide a flow of the raw batch material from the screw conveyor 18 of the feed chute 16 to the heater outlet 21. The heater 20 may be positioned in the well 23 within the furnace prior to the glass melt chamber 12 that may be established by the dam wall 22.

[0014] The dam wall 22 creates a well 23 in which the raw batch materials are heated and partially melted by the heaters in the well 23 before the batch flows over the dam wall 22 and enters the main volume of the furnace melt chamber 12. The top 27 of the dam wall 22 may be below the top surface of the glass melt level 28 in the furnace melt chamber 12. The melt level 28 may be an upper surface of the molten glass in the chamber 12.

[0015] In operation, raw batch materials are fed into the feed inlet 17 and the screw conveyor 18 transports the raw batch materials through the feed chute 16 into the heater 20. The heater 20 heats and partially melts at least some of the raw batch materials and the conveyor 24 in the heater 20 drives the batch material to the heater outlet 21 and into the lower portion of the well 23 formed by the dam wall 22 for partial melting prior to entering the melt chamber 12. The partially melted raw batch materials flow upward over the dam wall 22 out of the well 23 and into the furnace melt chamber 12.

[0016] The dam wall 22 creates a well in which CO2 may be released from the raw materials as the heaters 20 provide heat to, and partially melt, the raw materials. The release of CO2 from the raw materials in the well reduces the amount of CO2 bubbles that may form in the glass as the raw materials fully melt in the melt chamber 12. The removal of CO2 bubbles from the molten glass is referred to as refining. Removal of the CO2 in the well reduces the amount of time required to refine the glass in the melt chamber. As more partially melted batch material flows from the heater outlet 21 into the well 23, the melted batch material flows over the top 27 of the dam wall 22 into the melt pool 14 contained in the furnace melt chamber 12.

[0017] The height of the dam wall 22 can be varied to obtain different objectives. A short dam wall 22 will protect the feeder mechanism. A mid-height dam wall 22 will cause the batch material to be fed in the middle of the melt pool 14, or at the top surface of the melt pool 14. The percentage of batch material that is melted by the heater 20 in the mix of melted and unmelted batch material that flows over the dam wall 22 can be varied from approximately 25% to 75%, and more particularly from 40% to 50%, as desired.

[0018] FIG. 3 shows another illustrative embodiment of a glass melting furnace 48. This embodiment is similar in many respects to the embodiment of FIGS. 1-2, and like numerals among the embodiments generally designate like or corresponding elements throughout the several views of the drawing figures. Accordingly, the descriptions of the embodiments are incorporated into one another, and description of subject matter common to the embodiments generally may not be repeated here.

[0019] The glass melting furnace 48 has a chamber 49 in which a hopper 30 may be positioned adjacent to a wall 31 of the furnace melt chamber 49. The hopper 30 contains raw batch material 33 which is fed by gravity to a feed chamber 34 containing a screw conveyor 36, which may be carried at a level that is proximate a bottom portion 47 of the furnace 48. As used herein, the terminology proximate a bottom portion 47 may include at the bottom portion 47 or spaced apart therefrom but closer to the bottom than the top or at a position below the top surface of the molten glass pool 14 within the furnace melt chamber 49.

[0020] The screw conveyor 36 may be coupled by a high thermal resistance joint 37 to the output shaft 38 of a motor 39 contained in a motor housing 41. The motor housing 41 may be coupled to a source of cooling fluid 42 that circulates through the housing 41 to maintain the motor 39 at an acceptable operating temperature. The batch feed chamber 34 may be separated from the rest of the furnace melt chamber 49 by a dam wall 43. A top 44 of the dam wall 43 may be below the top surface of the melt level 45 in the furnace melt chamber 49. The height of the dam wall 43 can be varied to obtain different objectives. A short dam wall 43 will protect the screw conveyor 36 from the high temperatures of the melt pool 14 in the furnace melt chamber 49. A mid-height dam wall 43 will cause the batch material to be fed into the middle of the melt pool 14, and a high dam wall 43 will cause the batch material to be fed into the upper portion of the melt pool 14.

[0021] A heater 46 may be provided to heat the batch material in the feed chamber 34 and well 23 before it is driven over the top 44 of the dam wall 43. The heater 46 may span the gap between the dam wall 43 and the wall 31 of the furnace melt chamber 49 so that batch material exiting the feed chamber 34 may be forced through the heater 46. Alternatively, the heater 46 may be positioned on the side of the dam wall 43 facing the incoming batch material, and on the side of the furnace wall 31 that is in contact with the batch material within the well 23 so that batch material exiting the feed chamber 34 may be forced past the heater 46, or the heater 46 may be located in any other position. The heater 46 may be an electric heater, an induction heater, a gas radiation tube, or other suitable heating device.

[0022] In operation, gravity feeds batch material 33 from the hopper 30 into the feed chamber 34, and rotation of the screw conveyor 36 by the motor 39 drives the raw batch material 33 through the feed chamber 34 and upward through or past the heater 46. The heater 46 heats and partially melts at least some of the raw batch material 33 before it is introduced into the melt pool 14 in the furnace melt chamber 49. The outlet of the heater 46 may be below the melt level 45 in the furnace.

[0023] FIG. 4 shows an alternative embodiment of a glass melting furnace 55 having a furnace melt chamber 56 and a side mounted hopper 50 that supplies batch material 33 to a feed chamber that is part of a well 51 formed by a dam wall 52 located in the furnace melt chamber 56. The well 51 contains a vertical screw conveyor 53 that is located proximate the bottom wall 54 of the furnace 55, and heater elements 57 and 58 that are located on the side of the dam wall 52 and the side wall 59 of the furnace 55, respectively. Heat in the furnace 55 may be provided by top mounted heating elements 26. The batch material 33 in the hopper 50 is fed by gravity to a feed channel 61 having a sloped bottom feed wall 62 that is angularly related to the vertical side wall 63 of the hopper 50 and the bottom wall 54 of the furnace 55. The sloped bottom feed wall 62 may be angled between 30° and 60° to the bottom wall 54 of the furnace 55, and the sloped bottom feed wall 62 aids in maintaining an even flow of batch material 33 to the vertical screw conveyor 53.

[0024] The vertical screw conveyor 53 is arranged to convey batch material 33 upward from the well 51 to a top 64 of the dam wall 52. The vertical screw conveyor 53 may be coupled by a high thermal resistance joint 37 to the output shaft 38 of a motor 39 contained in a motor housing 41. The motor housing 41 may be coupled to a source of cooling fluid 42 that circulates through the motor housing 41 to maintain the motor 39 at an acceptable operating temperature. The well 51 is separated from the furnace melt chamber 56 by the dam wall 52. The top 64 of the dam wall 52 may be below a melt level 45 in the furnace melt chamber 56. The heater elements 57 and 58 heat the batch material flowing upward from the well 51 over the top 64 of the dam wall 52 into the melt pool 14 in the furnace melt chamber 56. The heater elements 57 and 58 may be an electric heater, an induction heater, a gas radiation tube, or other suitable heating device.

[0025] FIG. 5 shows another embodiment of a glass melting furnace 75 having a furnace melt chamber 82 including a side wall 81 and a bottom wall 79. The furnace melt chamber 82 contains a melt pool 14 of glass having a melt level 88. A batch feed hopper 77 is positioned adjacent to the side wall 81 of the furnace melt chamber 82 to supply batch material 33 under gravity to the bottom 84 of the hopper 77. A feed opening 87 in the side wall 81 of the furnace melt chamber 82 feeds batch material 33 from the bottom 84 of the hopper to the melt pool 14 of glass below the melt level 88. A screw conveyor 78 proximate the bottom wall 90 of the hopper 77 feeds the batch material 33 from the bottom 84 of the hopper 77 through the feed opening 87 and into the furnace melt chamber 82. The screw conveyor 78 is oriented generally horizontally proximate the bottom wall 90 of the hopper. Submerged heaters 76 proximate the bottom wall 79 of the furnace melt chamber 82 heat the melt pool 14 of glass in the furnace melt chamber 82. The feed opening 87 defines a plane and is positioned below the melt level 88 in furnace melt chamber 82. The screw conveyor 78 may be coupled by a high thermal resistance joint 37 to the output shaft 38 of a motor 39 contained in a motor housing 41. The motor housing 41 may be coupled to a source of cooling fluid 42 that circulates through the housing 41 to maintain the motor 39 at an acceptable operating temperature. The end 91 of the screw conveyor 78 is in approximate alignment with the plane of the feed opening 87. The submerged burners 76 create turbulence in the melt pool 14 in the furnace melt chamber 82 to provide mixing of the batch material 33 with the melt pool 14 of glass in the furnace melt chamber 82 as it passes thorough the feed opening 87 into furnace melt chamber 82.

[0026] The present disclosure is directed to the concept of feeding glass batch material into a furnace at a location below the melt level to eliminate problems associated with the glass batch "blanket" otherwise formed on the top surface of the melt. A screw conveyor may be used to feed the batch material into the melt pool in the furnace.

[0027] There thus has been disclosed an apparatus for feeding batch material into the furnace below the top surface of the melt pool that fully satisfies one or more of the objects and aims previously set forth.

Claims

1. A glass furnace (10, 48, 55, 75) comprising:

a furnace melt chamber (12, 49, 56, 82) to contain a glass melt (14) having a top surface; and

a batch feeder (16, 36, 53, 78) to receive glass batch material and feed said material to the furnace melt chamber below the level of the glass melt top surface, characterized in

a motor (39) having an output shaft (38) for driving the batch feeder in the form of a screw conveyor; and

a high thermal resistance joint (37) coupling the output shaft to the screw conveyor.

2. The furnace set forth in claim 1 further comprising:
a dam wall (22, 43, 52) disposed with respect to the screw conveyor such that batch material from the screw conveyor must flow upward over the dam wall before entering the furnace melt chamber.

3. The furnace set forth in claim 2 wherein a top (27, 44, 64) of the dam wall is below a melt level (28, 45, 88) in the furnace melt chamber.

4. The furnace set forth in claim 2 further comprising:
a heater (20, 46, 57, 58) disposed to heat glass batch material prior to flow over the dam wall.

5. The furnace set forth in claim 4 further comprising:
a well (23, 51) formed in the furnace melt chamber by the dam wall, wherein the heater is positioned in the well.

6. The furnace set forth in claim 4 further comprising:

a heating element for the heater; and

a screw conveyor (24) for feeding batch material to an outlet (21) of the heater.

7. The furnace set forth in claim 2 further comprising:

a heater (20, 46, 57) to introduce partially melted batch material into the furnace melt chamber; and

an outlet (21) for the heater positioned below the top of the dam wall.

8. The furnace set forth in claim 1 further comprising:

a feed chamber (34, 51);

a hopper (30, 50) for supplying batch material to the feed chamber; and

a heater (46, 57, 58) positioned between the dam wall and a wall (31, 59) of the furnace melt chamber, whereby the batch feeder feeds batch material from the feed chamber to the heater, and whereby the heater partially melts batch material emerging from an outlet of the feed chamber.

9. The furnace set forth in claim 8 wherein an outlet of the feed chamber is positioned within the furnace melt chamber.

10. The furnace set forth in claim 1 further comprising:

a motor housing (41) surrounding the motor; and,

a cooling fluid (42) filling the housing and surrounding the motor, the cooling fluid maintaining the motor at an acceptable temperature.

11. The furnace set forth in claim 1 further comprising:

a plurality of feed chutes (16) to introduce batch material into the furnace melt chamber below the melt level;

a plurality of heaters (20) that receive batch material from the feed chutes to raise the temperature of the batch material before it is introduced into the glass melt; and

a dam wall (22) establishing a well (23) in the furnace melt chamber to separate the heaters from the glass melt in the furnace.

12. The glass furnace set forth in claim 11 wherein the feed chutes include screw conveyors and heating elements.

13. The glass furnace set forth in claim 1 further comprising:

the furnace melt chamber including a wall (31, 59);

a batch feed hopper (30, 50) adjacent to the wall of the furnace melt chamber to supply batch material under gravity;

the batch feeder being proximate a bottom (34, 61) of the hopper to receive the batch material;

a dam wall (43, 52) at the end of the batch feeder forming a well (23); and

a heater (46, 57, 58) between the dam wall and the wall of the furnace melt chamber to heat the batch material in the well before flowing over the dam wall.

14. The glass furnace set forth claim 13 wherein the batch feeder is a screw conveyor oriented horizontally.

15.  The glass furnace set forth claim 13 wherein the batch feeder is a screw conveyor oriented vertically.

16. The glass furnace set forth claim 15 further comprising:
a sloped bottom feed wall (62) connecting the batch feed hopper to the well, whereby the sloped bottom feed wall aids in maintaining an even flow of batch material to the vertically oriented screw conveyor.

17. The glass furnace set forth in claim 1 further comprising:

the furnace melt chamber including a side wall (81) and a bottom wall (79) and containing a pool of glass melt (14) having a melt level (88);

a batch feed hopper (77) adjacent to the side wall of the furnace melt chamber to supply batch material under gravity to a bottom (84) of the hopper;

a feed opening (87) in the side wall of the furnace melt chamber for feeding batch material from the bottom of the hopper to the pool of glass melt below the melt level;

a batch feeder (78) proximate the bottom wall of the hopper to feed the batch material from the bottom of the hopper through the feed opening and into the furnace melt chamber; and

submerged heaters (76) proximate the bottom wall of the furnace melt chamber to heat the pool of glass melt in the furnace melt chamber, whereby the submerged heaters melt the batch material that is fed into the furnace melt chamber by the batch feeder.

18. The glass furnace of claim 17 wherein the batch feeder is a screw conveyor oriented generally horizontally proximate the bottom of the hopper.

19. The glass furnace of claim 18 wherein the feed opening in the side wall of the furnace defines a plane, and wherein the end of the screw conveyor is in approximate alignment with the plane of the feed opening.

Ansprüche

1. Glasofen (10, 48, 55, 75), umfassend:

eine Ofenschmelzkammer (12, 49, 56, 82) zur Aufnahme einer Glasschmelze (14), die eine Oberseite aufweist, und

eine Gemengezuführeinrichtung (16, 36, 53, 78) zum Aufnehmen von Glasgemengematerial und Zuführen des Materials zu der Ofenschmelzkammer unterhalb des Spiegels der Glasschmelzenoberseite, gekennzeichnet durch

einen Motor (39) mit einer Abtriebswelle (38) zum Antreiben der Gemengezuführeinrichtung in Form einer Förderschnecke; und

ein Verbindungsstück (37) mit hoher Wärmefestigkeit, das die Abtriebswelle mit der Förderschnecke verbindet.

2. Ofen nach Anspruch 1, ferner umfassend:
eine Dammwandung (22, 43, 52), die in Bezug auf die Förderschnecke derart angeordnet ist, dass Gemengematerial vor dem Eintritt in die Ofenschmelzkammer von der Förderschnecke aus nach oben, über die Dammwandung hinweg strömen muss.

3. Ofen nach Anspruch 2, wobei eine Oberseite (27, 44, 64) der Dammwandung unterhalb eines Schmelzenspiegels (28, 45, 88) in der Ofenschmelzkammer liegt.

4. Ofen nach Anspruch 2, ferner umfassend:
eine Heizeinrichtung (20, 46, 57, 58), die derart angeordnet ist, dass sie das Glasgemengematerial vor dem Strömen über die Dammwandung erhitzt.

5. Ofen nach Anspruch 4, ferner umfassend:
einen Schacht (23, 51), der durch die Dammwandung in der Ofenschmelzkammer gebildet ist, wobei die Heizeinrichtung in dem Schacht angeordnet ist.

6. Ofen nach Anspruch 4, ferner umfassend:

ein Heizelement für die Heizeinrichtung und

eine Förderschnecke (24) zum Zuführen von Gemengematerial zu einem Auslass (21) der Heizeinrichtung.

7. Ofen nach Anspruch 2, ferner umfassend:

eine Heizeinrichtung (20, 46, 57) zum Einführen von partiell aufgeschmolzenem Gemengematerial in die Ofenschmelzkammer und

einen Auslass (21) für die Heizeinrichtung, der unterhalb der Oberseite der Dammwandung angeordnet ist.

8. Ofen nach Anspruch 1, ferner umfassend:

eine Zuführkammer (34, 51),

einen Trichter (30, 50) zum Zuführen von Gemengematerial zu der Zuführkammer und

eine Heizeinrichtung (46, 57, 58), die zwischen der Dammwandung und einer Wandung (31, 59) der Ofenschmelzkammer angeordnet ist, wodurch die Gemengezuführeinrichtung Gemengematerial von der Zuführkammer zu der Heizeinrichtung zuführt und wodurch die Heizeinrichtung Gemengematerial, das aus einem Auslass der Zuführkammer austritt, partiell aufschmilzt.

9. Ofen nach Anspruch 8, wobei ein Auslass der Zuführkammer innerhalb der Ofenschmelzkammer angeordnet ist.

10. Ofen nach Anspruch 1, ferner umfassend:

ein Motorgehäuse (41), das den Motor umgibt, und

ein Kühlfluid (42), welches das Gehäuse füllt und den Motor umgibt, wobei das Kühlfluid den Motor auf einer annehmbaren Temperatur hält.

11. Ofen nach Anspruch 1, ferner umfassend:

eine Mehrzahl von Zuführrinnen (16) zum Einbringen von Gemengematerial in die Ofenschmelzkammer unterhalb des Schmelzenspiegels,

eine Mehrzahl von Heizeinrichtungen (20), die Gemengematerial aus den Zuführrinnen aufnehmen, um die Temperatur des Gemengematerials zu erhöhen, bevor dieses in die Glasschmelze eingebracht wird, und

eine Dammwandung (22), die einen Schacht (23) in der Ofenschmelzkammer bildet, um die Heizeinrichtungen von der Glasschmelze in dem Ofen zu trennen.

12. Glasofen nach Anspruch 11, wobei die Zuführrinnen Förderschnecken und Heizelemente umfassen.

13. Glasofen nach Anspruch 1, ferner umfassend:

die Ofenschmelzkammer mit einer Wandung (31, 59),

einen Gemengezuführtrichter (30, 50) angrenzend an die Wandung der Ofenschmelzkammer zum Zuführen von Gemengematerial unter Schwerkraftwirkung,

wobei sich die Gemengezuführeinrichtung nahe einer Unterseite (34, 61) des Trichter befindet, um das Gemengematerial aufzunehmen,

eine Dammwandung (43, 52) am Ende der Gemengezuführeinrichtung, die einen Schacht (23) bildet, und

eine Heizeinrichtung (46, 57, 58) zwischen der Dammwandung und der Wandung der Ofenschmelzkammer, um das Gemengematerial in dem Schacht aufzuheizen, bevor dieses über die Dammwandung strömt.

14. Glasofen nach Anspruch 13, wobei die Gemengezuführeinrichtung eine horizontal ausgerichtete Förderschnecke ist.

15. Glasofen nach Anspruch 13, wobei die Gemengezuführeinrichtung eine vertikal ausgerichtete Förderschnecke ist.

16. Glasofen nach Anspruch 15, ferner umfassend:
eine abgeschrägte untere Zuführwandung (62), die den Gemengezuführtrichter mit dem Schacht verbindet, wodurch die abgeschrägte untere Zuführwandung dabei hilft, eine gleichmäßige Strömung des Gemengematerials zu der vertikal ausgerichteten Förderschnecke aufrechtzuerhalten.

17. Glasofen nach Anspruch 1, ferner umfassend:

die Ofenschmelzkammer mit einer Seitenwandung (81) und einer Bodenwandung (79) und ein Schmelzglasbad (14) mit einem Schmelzenspiegel (88) enthaltend,

einen Gemengezuführtrichter (77) angrenzend an die Seitenwandung der Ofenschmelzkammer zum Zuführen von Gemengematerial unter Schwerkraftwirkung zu einer Unterseite des Trichters,

eine Zuführöffnung (87) in der Seitenwandung der Ofenschmelzkammer zum Zuführen von Gemengematerial von der Unterseite des Trichters in das Schmelzglasbad unterhalb des Schmelzenspiegels,

eine Gemengezuführeinrichtung (78) in der Nähe der unteren Wandung des Trichters zum Zuführen des Gemengematerials von der Unterseite des Trichters durch die Zuführöffnung und in die Ofenschmelzkammer und

versenkte Heizeinrichtungen (76) in der Nähe der Bodenwandung der Ofenschmelzkammer zum Erhitzen des Schmelzglasbades in der Ofenschmelzkammer, wodurch die versenkten Heizeinrichtungen das Gemengematerial aufschmelzen, das der Ofenschmelzkammer durch die Gemengezuführeinrichtung zugeführt wird.

18. Glasofen nach Anspruch 17, wobei die Gemengezuführeinrichtung ein Förderschnecke ist, die in der Nähe der Unterseite des Trichters im Wesentlichen horizontal ausgerichtet ist.

19. Glasofen nach Anspruch 18, wobei die Zuführöffnung in der Seitenwandung des Ofens eine Ebene definiert und wobei das Ende der Förderschnecke in etwa mit der Ebene der Zuführöffnung ausgerichtet ist.

Revendications

1. Four de verrerie (10, 48, 55, 75) comprenant:

une chambre de fusion de four (12, 49, 56, 82) pour contenir du verre en fusion (14) ayant une surface supérieure; et

un dispositif d'alimentation de composition (16, 36, 53, 78) pour recevoir un matériau de composition et alimenter ledit matériau vers la chambre de fusion de four sous le niveau de la surface supérieure de verre en fusion, caractérisé par

un moteur (39) ayant un arbre de sortie (38) pour entraîner le dispositif d'alimentation de composition sous la forme d'un convoyeur à vis; et

un joint à haute résistance thermique (37) couplant l'arbre de sortie au convoyeur à vis.

2. Four selon la revendication 1 comprenant en outre:
une paroi formant barrage (22, 43, 52) disposée par rapport au convoyeur à vis de telle manière que le matériau de composition venant du convoyeur à vis doit s'écouler vers le haut au-dessus de la paroi formant barrage avant d'entrer dans la chambre de fusion de four.

3. Four selon la revendication 2 dans lequel un haut (27, 44, 64) de la paroi formant barrage est au-dessous d'un niveau de verre en fusion (28, 45, 88) dans la chambre de fusion de four.

4. Four selon la revendication 2 comprenant en outre:
un dispositif de chauffage (20, 46, 57, 58) disposer pour chauffer le matériau de composition avant qu'il s'écoule au-dessus de la paroi formant barrage.

5. Four selon la revendication 4 comprenant en outre: un puits (23, 51) formé dans la chambre de fusion de four par la paroi formant barrage, dans lequel le dispositif de chauffage est positionné dans le puits.

6. Four selon la revendication 4 comprenant en outre:

un élément de chauffage pour le dispositif de chauffage ; et

un convoyeur à vis (24) pour alimenter le matériau de composition vers un orifice de sortie (21) du dispositif de chauffage.

7. Four selon la revendication 2 comprenant en outre:

un dispositif de chauffage (20, 46, 57) pour introduire le matériau de composition partiellement fondu dans la chambre de fusion de four; et

un orifice de sortie (21) pour le dispositif de chauffage positionné sous le haut de la paroi formant barrage.

8. Four selon la revendication 1 comprenant en outre:

une chambre d'alimentation (34, 51) ;

une trémie (30, 50) pour alimenter le matériau de composition vers la chambre de d'alimentation; et

un dispositif de chauffage (46, 57, 58) positionné entre la paroi formant barrage et une paroi (31, 59) de la chambre de fusion de four, moyennant quoi le dispositif d'alimentation de composition alimente le matériau de composition depuis la chambre d'alimentation vers le dispositif de chauffage, et moyennant quoi le dispositif de chauffage fait fondre partiellement le matériau de composition émergeant d'un orifice de sortie de la chambre d'alimentation.

9. Four selon la revendication 8 dans lequel un orifice de sortie de la chambre d'alimentation est positionné dans la chambre de fusion de four.

10. Four selon la revendication 1 comprenant en outre:

un carter de moteur (41) entourant le moteur ; et

un fluide de refroidissement (42) remplissant le carter et entourant le moteur, le fluide de refroidissement maintenant le moteur à une température acceptable.

11. Four selon la revendication 1 comprenant en outre:

une pluralité de goulottes d'alimentation (16) pour introduire du matériau de composition dans la chambre de fusion de four au-dessous du niveau de verre fondu;

une pluralité de dispositifs de chauffage (20) qui reçoivent du matériau de composition depuis les goulottes d'alimentation pour élever la température du matériau de composition avant qu'il soit introduit dans le verre en fusion; et

une paroi formant barrage (22) établissant un puits (23) dans la chambre de fusion de four pour séparer les dispositifs de chauffages du verre en fusion dans le four.

12. Four de verrerie selon la revendication 11 dans lequel les goulottes d'alimentation incluent des convoyeurs à vis et des éléments de chauffage.

13. Four de verrerie selon la revendication 1 comprenant en outre:

la chambre de fusion de four incluant une paroi (31, 59) ;

une trémie d'alimentation de composition (30, 50) adjacente à la paroi de la chambre de fusion de four pour alimenter du matériau de composition par gravité;

le dispositif d'alimentation de composition étant proche d'un fond (34, 61) de la trémie pour recevoir le matériau de composition;

une paroi formant barrage (43, 52) à l'extrémité du dispositif d'alimentation de composition formant un puits (23); et

un dispositif de chauffage (46, 57, 58) entre la paroi formant barrage et la paroi de la chambre de fusion de four pour chauffer le matériau de composition dans le puits avant qu'il s'écoule au-dessus de la paroi formant barrage.

14. Four de verrerie selon la revendication 13 dans lequel le dispositif d'alimentation de composition est un convoyeur à vis orienté horizontalement.

15. Four de verrerie selon la revendication 13 dans lequel le dispositif d'alimentation de composition est un convoyeur à vis orienté verticalement.

16. Four de verrerie selon la revendication 15 comprenant en outre:
une paroi d'alimentation de fond inclinée (62) reliant la trémie d'alimentation de composition au puits, moyennant quoi la paroi d'alimentation de fond inclinée aide à maintenir un écoulement égal du matériau de composition vers le convoyeur à vis orienté verticalement.

17. Four de verrerie selon la revendication 1 comprenant en outre:

la chambre de fusion de four incluant une paroi latérale (81) et une paroi de fond (79) et contenant un bain de verre en fusion (14) ayant un niveau de verre en fusion (88);

une trémie d'alimentation de composition (77) adjacente à la paroi latérale de la chambre de fusion de four pour alimenter du matériau de composition par gravité vers un fond (84) de la trémie;

une ouverture d'alimentation (87) dans la paroi latérale de la chambre de fusion de four pour alimenter du matériau de composition depuis le fond de la trémie vers le bain de verre en fusion sous le niveau de verre en fusion;

un dispositif d'alimentation de composition (78) proche de la paroi de fond de la trémie pour alimenter le matériau de composition depuis le fond de la trémie à travers l'ouverture d'alimentation et dans la chambre de fusion de four; et

des dispositifs de chauffage immergés (76) proches de la paroi de fond de la chambre de fusion de four pour chauffer le bain de verre en fusion dans la chambre de fusion de four, moyennant quoi les dispositif de chauffages immergés font fondre le matériau de composition qui est alimenté dans la chambre de fusion de four par le dispositif d'alimentation de composition.

18. Four de verrerie selon la revendication 17 dans lequel le dispositif d'alimentation de composition est un convoyeur à vis orienté globalement horizontalement à proximité du fond de la trémie.

19. Four de verrerie selon la revendication 18 dans lequel l'ouverture d'alimentation dans la paroi latérale du four définit un plan, et dans lequel l'extrémité du convoyeur à vis est en alignement approximatif avec le plan de l'ouverture d'alimentation.

Drawing